package com.junzhiit.nengji.app.web.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import com.google.zxing.common.BitMatrix;

public final class MatrixToImageWriter {

	private static final int BLACK = 0xFF000000;
	
	private static final int WHITE = 0xFFFFFFFF;
	
	private MatrixToImageWriter(){}
	
	public static BufferedImage toBufferedImage(BitMatrix matrix){
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
		for(int x = 0; x < width; x++){
			for (int y = 0; y < height; y++){
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}
	
	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException{
		BufferedImage image = toBufferedImage(matrix);
		if(!ImageIO.write(image, format, file)){
			throw new IOException("Could not write an image of format " 
					+ format + " to " + file);
		}
	}
	
	public static void writeToStream(BitMatrix matrix, String format,
			OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)){
			throw new IOException("Could not write an image of format " + format);
		}
	}
}
